Not ones that were designed specifically to be PvP enabled in all multiplayer modes.
An open PvE mode is unworkable for lots of reasons, ones you are happy to overlook because you consider those to be edge cases, yet you argue that the game we currently have is wanting because of different edge cases. Your argyuments are moot.
otoh the solid general advice regularly given in threads like these (with varying degrees of diplomacy) to up your game & use the tools already in the game just works. No Dev work required, no special mode to remember to select, just play the game, take on whatever challenges you are comfortable with and others can do the same. No edge cases, just solutions. Having trouble? Learn (from others or by yourself) how to get past that hurdle. Learning is fun